Your Mossberg could probably sit loaded and untouched for 5 years and run fine as long as nothing made a home in the barrel. One consideration might be the 3" 00 buck. That's a lot of recoil. Several companies make 2 3/4" low recoil plated buckshot now. It's got plenty of penetration for self-defense, but allows for quicker follow-up shots. Not saying the 3" won't do the job, just something to consider.
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